Affiliation:
1. Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
Abstract
Twenty salt-tolerant breeding lines of T. Aman rice were studied under field
conditions at the experimental farm of the Department of Genetics and Plant
Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University,
Bangladesh. The experiment was conducted following Randomized Complete Block
Design (RCBD) with three replications to estimate the genetic variations in
yield and yield-related traits, and their interrelationship and to assess
the direct and indirect effects of different yield-related traits on grain
yield for the selection of high-yielding T. Aman rice. Twelve characters
viz., days to flowering, days to maturity, plant height (cm), tillers per
hill, panicles per hill, flag leaf length (cm), panicle length (cm), panicle
weight (g), filled grains per panicle, spikelet fertility percentage,
100-grain weight (g) and grain yield per m2 (kg) were studied. The genotypes
differed significantly for all the traits studied indicating the wide range
of variations existed across the genotypes. The analysis of variance of all
characters studied was highly significant that revealed a wide range of
variability among the newly developed 20 salt-tolerant genotypes of T. Aman
rice. The genotypes BU1, BU4, BU6, BU7, and BU14 had high grain yields and
could be directly selected as high-yielding varieties. Based on all genetic
parameters, all the traits could significantly improve the grain yield of
salt-tolerant lines of T. Aman rice. The correlation coefficient revealed
that the genotype selected based on days to flowering, days to maturity,
plant height (cm), panicles per hill, flag leaf length (cm), panicle weight
(g), filled grains per panicle, and spikelet fertility (%) and 100-grain
weight directly would significantly contribute to grain yield of 20
salt-tolerant genotypes of T. Aman rice. However, considering the genotypic
correlations and path coefficients, direct selection on the basis of
panicles per hill, panicle weight, plant height, flag leaf length, filled
grains per panicle, spikelet fertility (%), days to flowering, and days to
maturity would significantly improve the grain yield of salt-tolerant T.
Aman rice genotypes.
Publisher
National Library of Serbia
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